Road Shifter / MTB derailleur mix and match question
OK, so I'm looking at buying a folder with road components on it. It has an 11-23 cassette. I would probably want to put a cassette on it with a wider range.
So, here's the question. If I go with an 11-32 or 34 cassette, I have to go with a mountain bike rear derailleur (Say, an XT) because a road derailleur will only accept a biggest rear cog of 27 teeth. Will the XT rear derailleur work with Ultegra shifters? The real question, I guess, is if they have the same gear spacing and if they do, do the shifters and derailleurs have the same actuation ratios?
I know this is kind of a weird question to pose, but I know from riding my DT that a 53-32 combination is marginal for really steep hills, but I like the taller gearing in the flats.
So does anyone know if I can have my cake and eat it too?
Jamis Nova, Bike Friday NWT, STRIDA, Austro Daimler Vent Noir, Haluzak Horizon, Salsa La Raza, Hollands Tourer, Bike Friday tikit
Assuming that the road and mtb cassettes have the same number of sprockets--probably 9--then you can use the same shifter for both of them. Turns out that sometimes a road derailer can accomodate a 11-32 (and almost always a 30t max sprocket). Typically, you need to adjust the B-screw to fit the bigger cassette.